fix(card): title styles being overridden by global typography

[crisbeto]

Fixes the card title styles potentially being overridden by the global .mat-typography styles if the title is set on a header node.

Fixes #10215.

[jelbourn]

Caretaker note: this might affect people's overrides.

[andrewseguin]

This ended up with quite a bit of screenshot diff failures internally - will take more time than we have to fix them and get approvals. This will likely have to wait until v7

[ngbot[bot]]

Hi @crisbeto! This PR has merge conflicts due to recent upstream merges. Please help to unblock it by resolving these conflicts. Thanks!

[mmalerba]

We're probably not going to be able to get this in for 7.0

[Totati]

V9 is comming. I hope after mdc debuting this and all the mess around mat-typography will be fixed too.

[mmalerba]

Closing since this fix is for the legacy mat-card which has been superseded by the MDC based one.

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